import axios from 'axios'

// 创建axios实例
const httpService = axios.create({
  withCredentials: true,
  // baseURL: "http://localhost:8081", // url前缀
  timeout: 3000 // 请求超时时间
});

// request拦截器
httpService.interceptors.request.use(
  config => {
    // 根据条件加入token-安全携带
    if (true) { // 需自定义
      // 让每个请求携带token
      config.headers['User-Token'] = '';
    }
    return config;
  },
  error => {
    // 请求错误处理
    Promise.reject(error);
  }
)

// respone拦截器
httpService.interceptors.response.use(
  response => {
    // 统一处理状态
    const res = response.data;
    if (res.code != 0) { // 需自定义
      // 返回异常
      return Promise.reject({
        status: res.code,
        message: res.desc
      });
    } else {
      return response.data;
    }
  },
  // 处理处理
  error => {
    if (error && error.response) {
      switch (error.response.status) {
        case 400:
          error.message = '错误请求';
          break;
        case 401:
          error.message = '未授权，请重新登录';
          break;
        case 403:
          error.message = '拒绝访问';
          break;
        case 404:
          error.message = '请求错误,未找到该资源';
          break;
        case 405:
          error.message = '请求方法未允许';
          break;
        case 408:
          error.message = '请求超时';
          break;
        case 500:
          error.message = '服务器端出错';
          break;
        case 501:
          error.message = '网络未实现';
          break;
        case 502:
          error.message = '网络错误';
          break;
        case 503:
          error.message = '服务不可用';
          break;
        case 504:
          error.message = '网络超时';
          break;
        case 505:
          error.message = 'http版本不支持该请求';
          break;
        default:
          error.message = `未知错误${error.response.status}`;
      }
    } else {
      error.message = "连接到服务器失败";
    }
    return Promise.reject(error);
  }
)

/*网络请求部分*/

/*
 *  get请求
 *  url:请求地址
 *  params:参数
 * */
export function get(url, params = {}) {
  return new Promise((resolve, reject) => {
    httpService({
      url: url,
      method: 'get',
      params: params
    }).then(response => {
      resolve(response);
    }).catch(error => {
      reject(error);
    });
  });
}

/*
 *  post请求
 *  url:请求地址
 *  params:参数
 * */
export function post(url, params = {}) {
  return new Promise((resolve, reject) => {
    httpService({
      url: url,
      method: 'post',
      data: params
    }).then(response => {
      resolve(response);
    }).catch(error => {
      reject(error);
    });
  });
}

/*
 *  put请求
 *  url:请求地址
 *  params:参数
 * */
export function put(url, params = {}) {
  return new Promise((resolve, reject) => {
    httpService({
      url: url,
      method: 'put',
      data: params
    }).then(response => {
      resolve(response);
    }).catch(error => {
      reject(error);
    });
  });
}

/*
 *  delete请求
 *  url:请求地址
 *  params:参数
 * */
export function del(url= {}) {
  return new Promise((resolve, reject) => {
    httpService({
      url: url,
      method: 'delete'
    }).then(response => {
      resolve(response);
    }).catch(error => {
      reject(error);
    });
  });
}

/*
 *  文件上传
 *  url:请求地址
 *  params:参数
 * */
export function fileUpload(url, params = {}) {
  return new Promise((resolve, reject) => {
    httpService({
      url: url,
      method: 'post',
      data: params,
      headers: { 'Content-Type': 'multipart/form-data' }
    }).then(response => {
      resolve(response);
    }).catch(error => {
      reject(error);
    });
  });
}

export default {
  get,
  post,
  del,
  fileUpload
}
